banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Study of the precursor and non-precursor implosion regimes in wire array Z-pinches
Rent this article for
View: Figures


Image of FIG. 1.
FIG. 1.

Configuration of an 8-ray 16-wire (a) closely spaced nested wire array. 3-ray 9-wire star arrays with (b) and without (c) precursor.

Image of FIG. 2.
FIG. 2.

Ablative forces on the inner wires of 4 and 8-ray closely spaced nested arrays, as a function of inner wire position, with outer diameter of 16 mm (a). Ablative j × B forces on all wires in investigated precursor/nonprecursor star array configuration pairs (b). Non-precursor configurations are those with the “empty” markers. Forces are calculated at I = 0.5 MA, and summed for all wires at a given position/diameter, positive points to the center, negative points outward.

Image of FIG. 3.
FIG. 3.

Contour plot of magnetic field (arb. units) around wire pairs in a 16/14 mm 8-wire closely spaced arrays. Array axis is at (0,0). Wire positions denoted by X.

Image of FIG. 4.
FIG. 4.

Two-frame shadowgraphy of a 8-wire 16/14 mm load, shot #2396, with no precursor (a), and late plasma on axis (b) 25 ns later, timing (c) and orientation (e). Shadowgram of 8-wire 16/15 mm load, shot #2400 (g), timing (d), and orientation (e). Shadowgram of a 6-wire 16/15 mm load #1344 (h). Original wire positions denoted by yellow lines, array axes by arrows.

Image of FIG. 5.
FIG. 5.

Optical streak camera image (a) of a regular cylindrical array, shot #2394 (b). Viewing direction for 8-wire closely spaced loads (c). Streak images of 8-wire 14/16 mm, shot #2395 (d) and 15/16 mm, shot #2400, (e) loads. The precursor plasma in (a) is indicated by arrow.

Image of FIG. 6.
FIG. 6.

532 nm shadowgram, probing direction (a) and frame timing (c) for a 16-wire 15.2/16 mm nested array #1068. 532 nm shadowgram (b) and frame timing (d) for a 12-wire 15/16 mm nested array #1352 (d). Gated ICCD image (e) for a 16-wire 15/16 mm nested array #2385. Precursor plasmas on the axes are indicated by arrows.

Image of FIG. 7.
FIG. 7.

532 nm shadowgram of early stage ablation in a 16-wire 16/14 mm load, shot #2625 (a). 532 nm (d) and 266 nm (e,f) shadowgrams of a 16-wire 16/14 mm load, shot #2393, (not to scale). Probing directions shown in (c). 532 nm shadowgrams of shot #1170 (g) 16/15.2 mm 16 × 10 μm load of shot #1164 (h) 16/15.2 mm 8 × 15 μm load. The latter two frames were taken at similar time—at 70% of the maximum current.

Image of FIG. 8.
FIG. 8.

X-ray yields for cylindrical, nested (ΔR = 4 mm), and CS loads (ΔR = 0.25−1 mm). Error bars display standard deviation within each group. Numbers in parenthesis give the number of shots in each group.

Image of FIG. 9.
FIG. 9.

keV x-ray power (PCD with 8 μm Be filter) for 8, 12, and 16-wire closely spaced loads (a). Signals are averages for indicated number of shots. KeV signal for the four 12-wire closely spaced loads (b).

Image of FIG. 10.
FIG. 10.

Shadowgrams of 3 × 3 wire load, shot #965, with precursor (a), 3 × 4 wire load, shot #1715 (b), without precursor at the array axis. Array axis denoted by arrow. (c) J × B forces on the wires of star arrays at I = 0.5 MA (by wire position, at diameter).

Image of FIG. 11.
FIG. 11.

532 nm shadowgrams of star wire array implosions, with respective probing directions and frame timing. Shot #2629, 18-wire 6-ray star with precursor (a), wires at 16/14/10 mm diameters. Shot #2626, 18-wire 6-ray star, non-precursor (b), 16/12/10 mm dia. Array axes denoted by arrows.

Image of FIG. 12.
FIG. 12.

X-ray yields for star arrays in precursor and non-precursor configurations (a). “Total x-ray energy (kJ)” values for shots #2684- #2687 are inferred and not directly comparable with shots #2626- #2636. KeV x-ray signals in GW (b) for nonprecursor (solid) and precursor (dashed) 3-ray stars.


Article metrics loading...


Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Study of the precursor and non-precursor implosion regimes in wire array Z-pinches